Grinding machine



Jan. 21, 1941. Q DEVAU 2,229,374

` GRINDING MACHINE Filed Feb. 2, 1959 3 Sheets-Sheet l Invehtor Jos/EPH 0. ZID/AU,

Jan 21, 1941- J. o. DEVAU GRINDING MACHINE Filed Pebl" zrless s sheets-sheet 2 G-ES' A tiorneys Jan. 21, 1941. J. o. Dl-:vAU

l GRINDING MACHINE Filed Feb. 2, 1939 3 Sheets-Sheet 3 In ventor Jos/EPH ,DEV/w,

A omeys Patented Jan. 21, 1941 UNITED STATES PATENT OFFICE 2 claims.

This invention appertains to new and useful improvements in grinding machines for grinding either fiat or concaved surfaces an-d which will be especially suitable for sharpening such articles as ice skates. L

The principal object of the present invention is to provide a grinding machine which includes an automatic feed mechanism. l

Another important object of the invention is to provide a grinding machine of the character stated wherein the grinding stone can readily be maintained properly dressed at all times.

Another important object of the invention is to provide a machine of the character stated wherein the parts can be conveniently and quickly adjusted. j

These and various other objects and advantages of the invention will be come apparent to the reader of the following specification.

In the drawings:

Figure 1 represents a side elevational view of the machine.

Figure 2 is a front elevational view.

Figure 3 is a vertical sectional view through the grind wheel mount.

Figure 4 is a fragmentary detailed sectional view of the feed mechanism drive gears.

Figure 5 is a top plan view.

Figure 6 is a section on the line 6-6 of Figure 5.

Figure 'I is a fragmentary detailed sectional view of the clutch mechanism.

Referring to the drawings wherein like numerals designate like parts it can be seen that the machine consists of the open top and bottom shell 5 resting upon the frame 6 which includes corner legs 1.

Numeral 8 represents the table which is formed. as shown in Figure 5, with a longitudinally extending slot 9. Longitudinally extending grooves I6 are formed in the top surface of this table 8 to catch pieces of metal and emery so that they will not interfere with the proper sliding action of the work-carrying plate Il.

This plate has rounded off ends i2. Bearing structures |3-I3 rise from the plate Il and through these extend the shaft I4, this shaft I4 having an arm I5 extending laterally therefrom and through which a set screw I6 is disposed. This set screw I6 is feedable against the plate to regulate the position of the shaft'l |4, which shaft carries the U-shaped clamp arms I1I1, through the upper portions of which are feedably disposed the clamp screws I8, each of which has a knurled knob I8 at its upper end. Numeral 20 represents theanvil against which work 'can be placed and which will be clamped in place thereon by the clamp screws |8.

The plate is slid on the grooved table 8 by the carriage 2|. This carriage 2| is provided with the depending formation 22 which extends downwardly through the slot 8 and is attached to one end of the rack bar 23. The other end of the rack bar is free to move under the table 8 and this rack bar meshes with the gear 24.

The gear 24 is carried by the shaft 25 which terminates in the pin 26 journalled in the recess in the adjacent end of the shaft 21. (See Fig. '7.) A cone pocket clutch plate 28 is suitably secured to the shaft 21, while splined to the shaft 25 is the clutch cone 29. A coiled compressible spring 30 is interposed between the cone 23 and the clutch plate 28 to throw the cone 29 away from the clutch plate 28 when tension on the spring 3| is relieved. The spring 3| is interposed between the pressure plate 32 and the cone 29. The pressure plate 32 is slidable on the shaft 25 and is adapted to be operated against the spring 3| to tension the same against the clutch cone 29 and cause engagement of the latter with the clutch plate 28 when the swingable members 33 are operated so that their rollers 34 ride against the plate and cause longitudinal movement of the plate on the shaft 25.

The levers 33 are carried by the bracket 35 and are operated by the elongated rod 36. This rod 36 'has one end disposed through one end of the shell 5 while the other end is disposed through the other end of the shell. The rod 36 carries a pair of abutment members 31 and 38, against which the lug 39 on the carriage 2| can strike.

As shown in Figure 1, a web 40 extends rearwardly from the shell 5 and on this is mounted the housing 4| containing the gear 42 on the shaft 21 and the worm 43 on the vertical shaft 44 which extends upwardly through the casting 45 on the web 40 and has the pulley 46 at its upper end located within the housing 41, this pulley 46 being connected by the belt 4B to the small pulley 49 on the armature shaft 50.

Also located on the armature shaft is the pulley 5| driving the belt 52 which is trained over the pulley 53 on the grind-stone shaft 54.

The forward end of the casting 45 has the vertically extending cylinder 55 suitably secured thereto and bored to receive the sleeve 56, in the upper and lower ends of which are the ball bearing mounts 51 through which the said shaft 54 is disposed.

A flaring hood 58 is secured to the lower end of the cylinder 55 for encasing the emery wheel 58 excepting for that portion which protrudes outwardly as shown in Figure 1.

An arcuate shaped guide is provided on one side of the hood 58 and is slotted as at 6| to receive the tightening screw 62 which is driven into the sleeve 63 through which the dressing tool 64 is feedable, this tool being feedable through the slot 65 in the hood 58 to engage the periphery of the wheel 59 to dress the same when required.

The cylinder 55 is provided with the spirally disposed slot-way 66 through which the screw 61 is disposed and driven in the sleeve 56, the screw 61 having the knurled head 68. Obviously, byv loosening the screw and moving the same, the sleeve 56 can be raised or lowered to change the elevation of the wheel 59.

Numeral 69 denotes a detent which consists of the barrel 10 threaded engaged into an opening in the cylinder 55. A plunger having a tapered extremity and denoted by numeral 1l is movable through the inner end of the barrel 10 to be disposed into a recess l2 in the sleeve 56 to hold the sleeve in the desired position. A stem 'i3 extends from this plunger li and has the knurled head M at its outer end.

Obviously, when the carriage 2| is moved against the abutment 31, the clutch members 28 and 29 will be engaged and the apparatus will start, feeding the plate Il longitudinally of the table 8 with the work engaging against the wheel 59, and until the lug 39 strikes the abutment 38 on the control rod 36, at which time the swingable members 33 (see Fig. 7) will be released so that the cone 29 will disengage from the clutch plate 28.

In the old type of skate-sharpening machines, the skate blade had to be slid in lengthwise under the clamp screws and this required removal of the shoe stockings which of course required time. In carrying out the present invention the U-shaped frames of the clamps are set in outwardly diverged relation with respect to the bulk of the machine end as is clearly shown in Figures 2 and 5 so that the skate and its shoe can be pushed inwardly between the frames I1 to be immediately disposed under the screws I8 without requiring any lengthwise feeding of the skate.

While the foregoing specication sets forth the invention in specific terms, it is to be understood that numerous changes in the shape, size and materials may be resorted to without departing from the spirit and scope of the invention as claimed hereinafter.

Having described the claimed as new is 1. A grinding machine comprising a table, a slidable work carrying plate on the table, a grinding unit mounted adjacent the slidable plate, said grinding unit including a vertically disposed cylinder, a sleeve slidably and rotatably disposed in the cylinder, said cylinder having a spirally extending groove in the side wall thereof, a screw member having a head, said screw member being disposed through the slot and into the sleeve and being feedable inwardly to bind the head of the screw against the outside of the cylinder to prevent the sleeve from sliding and rotating in the cylinder, bearing means in each end of the sleeve, a shaft disposed vertically through the sleeve and the bearings, a driven element for the shaft at the upper end thereof; and a grind wheel at the lower end of the shaft.

2. A grinding machine as claimed in claim l, including a pair of substantially U-shaped clamp frames disposed in vertical position and in divergeht relation with respect to each other, anvils carried at the lower ends of the frames, clamp screws extending through the upper ends of said clamps in axial alignment with said anvils, means on the plate for tiltably supporting said clamps for simultaneous adjustment, and means engageable with the plate and movable as a unit with said clamp for adjusting and holding the clamp in the desired position.

invention, what is JOSEPH O. DEVAU. 

